package week5;
import java.util.*;
/**
 * Created by dell on 2017/3/23.
 */
public class TryCatchAverage2 {
    public static void main(String[] args) {
        try {
            Scanner console = new Scanner(System.in);
            double sum = 0;
            int count = 0;
            while(true) {
                int number = console.nextInt();
                if(number == 0) {
                    break;
                }
                sum += number;
                count ++;
            }
            System.out.printf("平均 %.2f%n", sum / count);
        }catch (InputMismatchException ex) {
            System.out.println("必须输入整数");
        }
    }
}
